radeonsi: use LOAD_CONTEXT_REG_INDEX for VGT_STRMOUT_DRAW_OPAQUE
Based on PAL's UniversalCmdBuffer::CmdDrawOpaque.
We don't need to use PFP_SYNC_ME because it's done in emit_cache_flush.
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Based on PAL's UniversalCmdBuffer::CmdDrawOpaque.
We don't need to use PFP_SYNC_ME because it's done in emit_cache_flush.